GB2193189A

GB2193189A - A pack for flowable material

Info

Publication number: GB2193189A
Application number: GB08618380A
Authority: GB
Inventors: Hans Rausing
Original assignee: Tetra Pak Finance & Trading S A; Tetra Pak Finance and Trading SA
Current assignee: Tetra Pak Finance & Trading S A; Tetra Laval Holdings and Finance SA
Priority date: 1986-07-28
Filing date: 1986-07-28
Publication date: 1988-02-03
Anticipated expiration: 2006-07-28
Also published as: GB2193189B; ATE73081T1; DE3777003D1; JPS6333249A; EP0254968A3; EP0254968B1; US4878593A; AU596855B2; GB8618380D0; AU7599687A; EP0254968A2; ES2030022T3

Abstract

A pack for flowable material, includes a tube (1) having at least one longitudinal seam, with a base and a lid (2) mounted at its ends. The lid (2) is made of thermoplastics material without any base material, is welded to the tube (1) and has a pouring device (8). The tube (1) is made of base material such as cardboard, coated with thermoplastics material on at least one side. The lid (2) is a separate, prefabricated part fitted by means of a flange (5) engaging round the top edge (6) of the tube (1) and welded to the edge (6). This lid (2) has a part (21) of its surface at a lower level than its outer surface, with part of the lower level surface (21) extending near to the edge (6) of the tube, in such a way that the lid (2) engages round the edge (6) of the tube substantially in a U shape in the region of said part (21 ) of the lower level surface.

Description

1 GB2193189A 1 SPECIFICATION According to the present invention there is

provided a pack for flowable material, includ A pack for flowable material ing a tube having at least one longitudinal seam and a base a lid mounted at the tube This invention relates to a pack for flowable 70 ends, which lid is made of thermoplastics ma material, including a tube having at least one terial without any base material, is welded to longitudinal seam and a base and a lid the tube and has a pouring device, and which mounted at the tube ends, which lid is made tube is made of base material such as card of thermoplastics material without any base board, coated with thermoplastics material on material, is welded to the tube and has a 75 at least one side, wherein the lid is a sepa pouring device, and which tube is made of rate, prefabricated part fitted to the tube by base material such as cardboard, coated with means of a flange engaging round a top edge thermoplastics material on at least one side. of the tube and welded to the tube top edge, Packs of this kind are known in many differ- and wherein the lid has a part of its surface at ent forms. In a particular pack of this type the 80 a lower level than its outer surface, with part lid is round in plan view and is moulded onto of the lower level surface extending near to the wall of the tube, which is round in cross- the edge of the tube, in such a way that the section, to ensure that the lid is fixed securely lid engages round the edge of the tube sub and in liquid tight manner to the top edge of stantially in a U shape in the region of said the tube. This involves using expensive ma- 85 part of the lower level surface.

chines with exactly adjusted tool components, The prefabricated lid has a flange projecting so a considerable outlay is required for packs outside the edge at one side, the diameter of of the known type to be produced in large the flange being such that the flange can en quantities per unit of time. gage round the outside of the top edge of the In another known liquid pack the base is 90 tube. The fact that part of the surface is lowformed by a separate, flat piece of wall with ered or drawn down towards the inside of the thermoplastics material on at least one surface pack from the original external plane of the lid and is welded to the edge of the tube, which enables the lid material to engage over the is round in cross-section. The plane of the edge of the tube in a U shape wherever the base lies within the tube and is arranged 95 lower level part of the surface touches the transversely to the side walls of the pack, edge of the tube. The lower level part of the formed by the tube, the edges of the base surface is thus taken near the edge of the engaging over the edge of the tube in a U tube, so that it engages over the edge in a U shape. This form of base is chosen because it shape as in the known base. In accordance can be prefabricted cheaply and in heavy duty 100 with the invention only the region of the pour machines, stored and conveniently taken out ing device is recessed, so that the above of store and sealed onto the edge of the mentioned disadvantages are not met with in tube. Since the edge of the lid engages in a U pouring. Furthermore, the favourable shape of shape over the lower edge of the tube (lower the edge of the lid is utilised to apply pres because of the base), the welding jaws can 105 sure and counterpressure when welding the lid engage round the edge of the tube on both to the edge of the tube.

sides and exert compressibve forces, whereby In accordance with the invention it is there the most favourable sealing action and thus fore particularly desirable for the lower level the most favourable liquid proofing action can part of the lid surface to end some distance in be obtained. 110 front of the pouring device. If an expert were However, if it is desired to fix the lid of the to object that the pouring device area, particu pack in this way the only possibility is to ar- larly if it is to be at the edge of the lid, does range the pouring device a considerable dis- not have the favourable shape required for tance away from the edge of the lid. Also it pressure and counterpressure in the welding would be a disadvantage to have to open 115 process, so that sealing would not be pos such a pack and empty out its contents be- sible in the pouring area, the invention here cause the contents, on leaving the lid, would teaches a method whereby good welding and have to run lower level wall of the lid then sealing between the lid and the tube can nev flow back over th higher edge. Such a pouring ertheless be obtained at the edge of the tube.

action is unfavourable and undesirable. If the 120 The tensile stress in the paper has to be util pouring device is required to be at the edge ised in welding the lid to the paper tube. The of the lid, then the engagement of the edge of tensile stress can be utilised in a particularly the tube over both sides to fix the lid to the favourable way for the opposing force of the tube breaks down completely. welding jaw if the pouring aperture is in a There is thus a need for a generally im- 125 very curved part of the edge of the lid. The proved pack where an easily produced lid with lid is preferably square in plan view, and the good pouring properties can be mounted in a pouring device is in a corner of the square.

liquid tight manner, without the stacking pro- The angle is here approximately 90' and thus perties of such a pack suffering to any marked generates a not inconsiderable tensile stress in degree. 130 the paper. It is sufficient to support a strong 2 GB2193189A 2 opposing force when welding jaws are from the level 22 towards the interior of the pressed onto the lid from the outside in the pack. This lower level surface surrounds the direction of the outer surface of the tube. pouring aperture 7 of the pouring device In accordance with the invention it also de- shown generally at 8.

sirable for the flat surface surrounding the 70 From Fig. 2, which is a sectional view taken pouring aperture of the pouring device to be along the line 11-11 in Fig. 1, it will be seen approximately at the level of the top edge of that wherever the lower level part 21 of the the tube. This makes it possible to optimise surface is taken near the edge 6 of the tube the pouring properties of the pouring device the edge of the lid engages over the edge 6 according to the invention, which have already 75 in a U shape. This happens on both sides in been touched on above. When the outflowing Fig. 2, i.e. at the left and right hand side liquid has left the pouring aperture, it need along the edge 6 of the tube, whereas in Fig.

only flow on over the flat surface surrounding 3, which shows the section 111-111 in Fig. 1, it the aperture, to reach a pouring edge at the only happens at the right hand side. Because outer extremity; the stream of liquid can leave 80 the section 111-111 is bent back in Fig. 1, i.e.

that edge and form a jet in the desired, ideal although the centre runs through the pouring manner. device 8 at the front it does not run through For a better understanding of prsent inven- the handle 4 at the back, Fig, 3 shows not tion, and to show how the same may be car- the handle but merely the oblique wall of the ried into effect, reference will now be made, 85 tube.

by way of example, to the accompanying In the Fig. 1 embodiment the lower level drawings, in which: part 21 of the surfce is as large as possible.

Figure 1 is a perspective fragmentary plan It surrounds the pouring device 8 as far as view of a specially designed pack with a lid possible on all sides up to the front pouring according to one embodiment of the inventip 9, so that the engagement of the thermo tion, plastic lid material round the edge 6 of the Figure 2 is a fragmentary diagramatic cross- tube in a U shape continue even round the sectional view taken along the line 11-11 in Fig. pouring device 8.

1, In the other embodiment shown in Fig. 4 Figure 3 is a cross sectional view taken al- 95 the lower level part 21 of the surface has a ing the line 111-111 in Fig. 1 and substantially trapezoidal shape, without coming Figure 4 is a plan view of a lid a pack closer to the pouring aperture 7 or even en according to a different embodiment of the closing it on three sides. Tests have shown invention, with part of the surface trapezoidal that the tensile stress in the paper material of and at a lower level. 100 the tube 1 is such as to be well able to bear A pack of the invention for flowable, e.g. the inward pressure of the welding jaws in the liquid, material has a tube 1 which forms the vicinity of the pouring device.

side surfaces and is made of paper coated

Claims

with thermoplastics material on both sides. A CLAIMS base (not shown),

which may e.g. be square, 105 1. A pack for flowable material, including a is provided at the bottom end of the tube. It tube having at least one longitudinal seam and is made from the folded over tube of the pack a base and a lid mounted at the tube ends, as a folded closure, and has a transverse which lid is made of thermoplastic material seam with triangular flaps folded over onto an without any base material, is welded to the adjacent wall. 110 tube and has a pouring device, and which A lid
2 is triangular in plan view, with two tube is made of base material such as card- edges running along the edges of the two flat board, coated with thermoplastics material on side surfaces and the third line of the triangle, at least one side, wherein the lid is a sepa that joining these two sides, running along the rate, prefabricated part fitted to the tube by diagonal, if the pack is looked at from above, 115 means of a flange engaging round a top edge with the pack being square in cross section at of the tube and welded to the tube top edge, top and bottom. In the other half of the and wherein the lid has a part of its surface at square, so to speak, as seen from above, a lower level than its outer surface, with part there is a recess in the region
3 of the pack of the lower level surface extending near to (Figs. 1 and 4), such that the body of the 120 the edge of the tube, in such a way that the pack tapers upwardly. A handle 4 is provided lid engages round the edge of the tube sub on the tapering part of the body. The lid 2 is stantially in a U shape in the region of said -particularly important to the invention. It is a part of the lower level surface.

separate, prefabricated part made of thermo- 2. A pack according to claim 1, wherein plastics material without any base material. At 125 the lower level part of the surface of the lid the outer periphery it has a flange 5 which terminates short of the pouring device.

stands out at one side engages round the top 3. A pack according to claim 1 or claim 2, edge 6 of the tube 1. wherein the part of the lid outer surfaces sur The lid 2 also has a lower level part 21 of rounding a pouring aperture of the pouring de- the surface, which is drawn deeper or sunk 130 vice is substantially at the level of the top GB2193189A 3 edge of the tube.
4. A pack for flowble material, substantially as hereinbefore described with rference to Figs. 1 to 3 or Fig. 4 of the accompanying 5 drawings.

Published 1988 at The Patent Office, State House, 66/71 High Holborn, London WC 1 R 4TP. Further copies may be obtained from The Patent office, Sales Branch, St Mary Cray, Orpington, KentBR5 3RD. Printed by Burgess & Son (Abingdon) Ltd. Con. 1/87.